Nanoparticle Nanotubes

Lahav, Michal; Sehayek, Tali; Vaskevich, Alexander; Rubinstein, Israel

doi:10.1002/ange.200352216

Cited by 29 publications

(16 citation statements)

References 31 publications

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“…Figure 4a provides a clear understanding of the growth mechanism of Ni nanotubes. The junction between the electrode surface and the bottom edge of the template pore serves as a preferential site for the deposition of metal ions, because the inner walls of the nanochannels have surface absorption energy [25,26]. At the beginning, Ni ions move toward the electrode and receive electrons to become atoms.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Growth Mechanism of Ni Nanotubes and Nanowires

Wang

Gao

et al. 2009

Nanoscale Res Lett

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Highly ordered Ni nanotube and nanowire arrays were fabricated via electrodeposition. The Ni microstructures and the process of the formation were investigated using conventional and high-resolution transmission electron microscope. Herein, we demonstrated the systematic fabrication of Ni nanotube and nanowire arrays and proposed an original growth mechanism. With the different deposition time, nanotubes or nanowires can be obtained. Tubular nanostructures can be obtained at short time, while nanowires take longer time to form. This formation mechanism is applicable to design and synthesize other metal nanostructures and even compound nanostuctures via template-based electrodeposition.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Growth Mechanism of Ni Nanotubes and Nanowires

Wang

Gao

et al. 2009

Nanoscale Res Lett

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“…Because of their reduced coordination number and high surface area, porous parts of the template (alumina) serve as energetically favorable sites for initiating metal atom adsorption. 28,29 When a negative potential is applied to the working electrode, divalent metal ions of Co 2+ surrounded by the hydration layer move toward the cathode and reduce to metal. This is a tristage process as follows:…”

Section: Resultsmentioning

confidence: 99%

Synthesis of High Coercivity Cobalt Nanotubes with Acetate Precursors and Elucidation of the Mechanism of Growth

et al. 2008

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Cobalt nanotubes (CoNTs) with very high longitudinal coercivity were prepared by electrodeposition of cobalt acetate for the first time by using anodized alumina (AAO) template. They were then characterized with X-ray diffraction (XRD), a field emission scanning electron microscope (FESEM), and a transmission electron microscope (TEM). Formation of a highly ordered hexagonal cobalt phase is observed. Room temperature SQUID (superconducting quantum interference device) magnetometer measurements indicate that the easy axis of magnetization is parallel to the nanotube axis. These CoNTs exhibit very high longitudinal coercivity of ∼820 Oe. A very high intertubular interaction resulting from magnetostatic dipolar interaction between nanotubes is observed. Thick-walled nanotubes were also fabricated by using cobalt acetate tetrahydrate precursors. A plausible mechanism for the formation of CoNTs based on mobility assisted growth is proposed. The role of the hydration layer and the mobility of metal ions are elucidated in the case of the growth mechanism of one-dimensional geometry.

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“…[ 26,27 ] We utilized a positively charged polyelectrolyte, polyethylenimine (PEI, MW = 70000, Polysciences), for surface modifi cation of the inner pore walls. A 0.2% aqueous solution of PEI was deposited on the pore walls by spin-coating at 3000 rpm for ≈40 s followed by rinsing with Nanopure water (18.2 MΩ cm −1 ).…”

Section: Pam-agnc Substratementioning

confidence: 99%

Silver Nanocube Aggregates in Cylindrical Pores for Higher Refractive Index Plasmonic Sensing

König

Kodiyath

Combs

et al. 2013

Part & Part Syst Charact

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We report on silver nanocubes (AgNCs) infiltrated into cylindrical nanopores of porous alumina membranes (PAM) with an outstanding chemical sensitivity based on refractive index sensing (RIS) measurements. Numerical simulations performed using the finite‐difference time‐domain (FDTD) method suggested that the enhanced sensitivity is based mainly on the inter‐pore coupling plasmonic effect. This effect is related to plasmonic amplification based on localized surface plasmon resonance (LSPR) coupling between AgNCs located at the pore walls of neighboring cylindrical pores and separated by a nanoscale wall. Results are discussed for different aggregation scenarios ranging from individual nanocubes through pentamers on a flat glass surface, a flat alumina surface, and a concave local shape representing the experimental conditions. An experimental RIS sensitivity of about 770 nm per refractive index unit was found to be more than an order of magnitude higher for silver nanocube aggregates within cylindrical pores than that observed for ordinary planar substrates.

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Nanoparticle Nanotubes

Cited by 29 publications

References 31 publications

Synthesis and Growth Mechanism of Ni Nanotubes and Nanowires

Synthesis and Growth Mechanism of Ni Nanotubes and Nanowires

Synthesis of High Coercivity Cobalt Nanotubes with Acetate Precursors and Elucidation of the Mechanism of Growth

Silver Nanocube Aggregates in Cylindrical Pores for Higher Refractive Index Plasmonic Sensing

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